OICC Press Iranian Journal of Earth Sciences 2228-785X 5 2 2013 03 21 Synthesis of Zeolites, Merlinoite Minerals of Damavand’s Natural Clinoptiloite Zeolites Mineral in Hydrothermal Conditions, under the Influence of Alkaline 21 24 EN Majid Pourmoghaddam Ph. D. Student in Mineralogy, Armenia State University Journal Article 2013 03 21 In the present research synthesis of zeolites, merlinoite minerals of natural clinoptiloite mineral in the presence of alkaline mediums, was investigated. The analyzed variants are a result of a concentration of Na+ and K+ ions, temperature and time. Phase transition of clinoptiloite was conducted in the presence of an 8 molar potash solution (KOH) and a 4 molar soda solution (NaOH). Results indicated that merlinoite phase occurs at a temperature of 200 degrees centigrade and the presence of highly concentrated ions of Na+. With the passage of reaction time, the concentration of the synthesized merlinoite is increased accordingly. XRD studies suggest orthorhombic synchrony with the dimensions of c = 9.45 Aº, a = 14/12 Aº, d = 2/19 Aº, n = 1/494 Aº for merlinoite.